Android: programmatically adding buttons to a layout

Question

I\'m trying to get an add button to add another button to the layout, based on the edittext to the left of the button. The point is for a person to list the rooms in their

Answer 1

Try this :

    //the layout on which you are working
    LinearLayout layout = (LinearLayout) findViewById(R.id.linear_layout_tags);

    //set the properties for button
    Button btnTag = new Button(this);
    btnTag.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
    btnTag.setText("Button");
    btnTag.setId(some_random_id);

    //add button to the layout
    layout.addView(btnTag);

Answer 2

I would add an id to your LinearLayout in xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@id/llContainer"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical" >

And then change your onClick to this:

public void onClick(View v) {
    switch (v.getId()) {

    case R.id.btnAddARoom:
        //add a room
        //Find you parent layout which we'll be adding your button to:
        LinearLayout layout = (LinearLayout) findViewById(R.id.llContainer);

        roomName = etAddARoom.getText().toString();
        Button createdButton = new Button(this);
        createdButton.setText(roomName);
        createdButton.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,         LayoutParams.WRAP_CONTENT));
        layout.addView(createdButton);

        //if no rooms make tvnorooms disappear

        break;
    }
}

Answer 3

Each button needs to have an onclicklistener to tell it what to do. this can be added to your java code under where you state your button.

Button createdButton = new Button(this);
createdButton.setOnClickListener(new OnClickListener()
{

code you want implemented

}

Answer 4

Try this code:

LinearLayout l_layout = (LinearLayout) findViewById(R.id.linear_layout); 
l_layout.setOrientation(LinearLayout.VERTICAL);

Button btn1 = new Button(this);
btn1.setText("Button_text");

l_layout.addView(btn1);

btn1.setOnClickListener(new OnClickListener()
{
     @Override
     public void onClick(View v) {
           // put code on click operation
     }
}

that is a way to create button dynamically and add in Layout.

remember that when you create button programmatically you just use this not Class_name.this

Answer 5

public class AndroidWalkthroughApp1 extends Activity implements View.OnClickListener {

    final int TOP_ID = 3;
    final int BOTTOM_ID = 4;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // create two layouts to hold buttons
        LinearLayout top = new LinearLayout(this);
        top.setId(TOP_ID);
        LinearLayout bottom = new LinearLayout(this);
        bottom.setId(BOTTOM_ID);

        // create buttons in a loop
        for (int i = 0; i < 2; i++) {
            Button button = new Button(this);
            button.setText("Button " + i);
            // R.id won't be generated for us, so we need to create one
            button.setId(i);

            // add our event handler (less memory than an anonymous inner class)
            button.setOnClickListener(this);

            // add generated button to view
            if (i == 0) {
                top.addView(button);
            }
            else {
                bottom.addView(button);
            }
        }

        // add generated layouts to root layout view
        LinearLayout root = (LinearLayout)this.findViewById(R.id.root_layout);
        root.addView(top);
        root.addView(bottom);
    }

    @Override
    public void onClick(View v) {
        // show a message with the button's ID
        Toast toast = Toast.makeText(AndroidWalkthroughApp1.this, "You clicked button " + v.getId(), Toast.LENGTH_LONG);
        toast.show();

        // get the parent layout and remove the clicked button
        LinearLayout parentLayout = (LinearLayout)v.getParent();
        parentLayout.removeView(v);
    }
}